TM 11-6625-3081-237-31.VIDEO SIGNAL GENERATOR (VSG) CASE ASSEMBLY 2A2A7A17-31INPUT CODE:VSGST (cont)a. DESCRIPTION (cont)The VSG is then programmed for an 875 line rate and the blanking level for 0.3volts.The displayed video output is measured by the programmable digitizer, whichis triggered by the VSG and the following checks made:The horizontal sync width for 2.0 to 3.5 microseconds.The horizontal sync period for 35.0 to 40.0 microseconds.The porch level of the display output signal for -0.075 to +0.75 vdc.The difference between the porch level and the sync level for +0.1 to+0.4 vdc.The time from the start of the last horizontal sync of the even field to thebeginning of the odd vertical sync for 36.0 to 40.0 microseconds.The time from the start of the odd field vertical sync to the start of thefirst pulse for 15.0 to 19.0 microseconds.The time from the start of the odd field vertical sync to the start of thesixth pulse for 112.0 to 116.0 microseconds.The time from the start of the sixth pulse of the odd field vertical sync tothe next positive transition for 3.0 to 6.0 microseconds.The time from the first positive transition after the odd field vertical syncto the start of the next horizontal sync for 34.O. to 36.0 microseconds.The time from the start of the last horizontal sync of the odd field to thebeginning of the even field vertical sync for 15.0 to 22.0 microseconds.To check composite video without sine wave, a 20 microsecond window is placed11 microseconds after the start of horizontal sync. The brightness level isprogrammed to +1.0 vdc and the programmable digitizer assembly is triggered10 microseconds after the start of horizontal sync and the following checks made:The window to start 0.6 to 1.4 microseconds after the trigger.The width of the window to 19.6 to 20.4 microseconds.The amplitude of the window for +0.25 to +0.75 vdc.7-160